Many universities and research centers all over the world have conducted channel sounding measurements and research at frequencies above 100 GHz, including Aalto University [1]}, New York University (NYU) [2]}, University of Southern California (USC) [3]}, Beijing Jiao Tong University (BJTU) [4]}, Shanghai Jiao Tong University (SJTU) [5]}, Georgia Institute of Technology [6]}, Brown University [7]}, Technische University Braunschweig (TUBS) [8]}, Koc University [9]}, University of Surrey [10]}, and Pohang University of Science and Technology [11]}. These works have proven that sub-THz and THz frequencies can be used for future 6G wireless communications as the current mmWave 5G networks. However, what is the coverage for sub-THz communication systems and how is the system performance is still a question mark.
